JPS6127717A - Vehicle heater - Google Patents

Abstract

PURPOSE:To make it possible to realize an ideal heating of keeping the head cool and the feet warm with a less heating load, by disposing a heater core using cooling water heated by an engine and a blower in a storage casing for blow-out ports for circulation hot air fed around the feet of passengers and for an air-intake port for circulation air. CONSTITUTION:When a blower operating switch is turned to a contact for feeding air at an arbitrary feed level, hot air is fed from a front seat hot air blow-out port (a), and comes up after impinging upon the lower section of the front seat to be drawn into a circulation air intake port (b) so that a hot air circulating stream is established around the feet of passengers. Further, when an operating switch for an auxiliary fan 7 is turned on in order to feed hot air around the foots of passengers on the rear seat, hot air above the surface of the front seat floor is drawn into and through a suction port (d) and is blown out from a blow-out port (e) to the foots of the passengers on the rear seat. The hot air is then divided into two streams at the center of the floor, and is returned along both side walls of the passenger's compartment to the surface of the front seat floor to be drawn into the intake port (b). Thus, the hot air stream circulating along the floor surface is not made into contact with the window glass panes and the ceiling so that a capacity of heat is prevented from being rapidly taken out outboard of the vehicle, and therefore, has an extremely less heat loss, thereby it is possible to realize a comfortable heating with a less heat energy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auxiliary heating system for a vehicle that uses engine cooling hot water as a heat source.

[Prior art] Passenger vehicles powered by internal combustion engines are generally heated using the heat retained in the engine cooling hot water, but diesel engines and other engines have recently been developed that have a high efficiency in converting combustion energy into power. Even in high-efficiency gasoline engines, the degree of rise in engine coolant temperature is considerably lower than in ordinary gasoline engines, and this leads to an undesirable situation from the perspective of securing thermal energy for heating the vehicle interior. There is. In other words, in cold regions, it has become difficult to obtain a satisfactory sense of warmth by relying on conventional heating methods.

Furthermore, with conventional heating systems, the amount of thermal energy that is lost by being released outside the vehicle during ventilation, or dissipated through window glass with high heat transmittance, has to increase significantly.

[Object of the Invention] The present invention is characterized in that the degree of flow of thermal energy to the outside of the vehicle is extremely small. The purpose of the present invention is to provide a new type of heating device that can comfortably heat a vehicle interior even with a smaller amount of thermal energy by using it in combination with a conventional heating device that receives heat.

[Structure of the Invention] The vehicle heating device of the present invention includes an inside/outside air switching box at the entrance end,
It is also an auxiliary device for the main heating system, consisting of a heating/cooling heat exchanger and a blower housed in a ventilation passage with a ventilation outlet, a defrost outlet, and a heat outlet at the exit end. A heater core that uses engine cooling hot water as a heat source and a blower are housed in a casing that is equipped with a hot air outlet that can generate a circulating heating airflow and an intake port for the circulating air.

According to a preferred embodiment of the present invention, a duct for extending the hot air outlet is provided as an auxiliary outlet for the hot air outlet, or the apparatus of the present invention is separately installed in the vehicle interior for the circulating air flow. The casing is used in combination with an auxiliary fan for forced generation, an outlet for cold heat supplied from a separately installed cooling device is attached to the casing, a means for adjusting the amount of drought water flowing into the heater core is attached, and the casing is attached to the casing. The fan is installed at the bottom of the center of the instrument panel of a passenger car or at the bottom of the seat, and the fan is installed at the bottom of the rear seat.

[Effects of the Invention] The vehicle heating device of the present invention having the above configuration has the following effects.

b) Approximately 70% of the heating expenditure for passenger cars is due to ventilation, and it is desirable to suppress the introduction of outside air as much as possible, but if you rely too much on inside air circulation, it may cause the inconvenience of condensation on the window glass. arise. Therefore, in the present invention, the lower space of the vehicle interior, which is free from dew condensation, uses the heating device of the present invention, which is dedicated to internal air circulation, and only the upper space of the vehicle interior has a role played by the conventional main heating device that introduces outside air. By adopting a method of having a receiver, it is possible to reduce the heat load for heating by half compared to conventional heating systems.

Since the hot air circulation area is limited to the lower space of the vehicle interior and does not involve the introduction of outside air, the heating effect is excellent immediately after the engine is started and running.

c) In cases where the existing main heating device, which has a superior role in warming the upper space of the vehicle interior, is weakly working or not working, the so-called ``cool-head-warm-feet-type'' heating, which has been handed down for a long time, is carried out.

[Example] Next, a vehicle heating device of the present invention will be described based on an example shown in the drawings.

In FIG. 1, which is a side sectional view of an automobile depicting a basic embodiment of the device of the present invention, A is the device of the present invention disposed in contact with the vehicle body floor E below the instrument panel, and the hot air outlet a A heater core 2 whose heat source is hot water supplied from an engine cooling water jacket C and a blower 3 for intake and discharge of the circulating air are housed in a casing 1 equipped with a circulating air intake port. There is. 4 and 5 are piping for hot water circulation connecting the heater core 2 and water jacket C, and an A-tar valve 6 is interposed in the outgoing piping 4. Also, in this example, an auxiliary fan for hot air circulation is installed under the front seat G. 7 is installed. Reference numeral 8 denotes a case of the fan 1, which has a warm air inlet d and an outlet e. 15 is a duct connecting the case 8 and the suction port d.

B is a completely independent vehicle interior heating and cooling unit except that it shares hot water pipes 4 and 5 with the device of the present invention, and a single indoor/outside air switching introduction damper 1 and a blower J are attached to one end of the housing H. , one-piece mix damper L1 heater core M1 is sequentially installed in the cooling evaporator downstream.
Conditioned air Suita [1 selection and blowout amount adjusting damper group N is incorporated, and a plurality of blowout ports P are opened at the other end. F
is an exhaust hole for ventilation installed in the car body wall.

Furthermore, FIG. 3 shows a front view of the instrument panel showing how the device of the present invention is installed in the passenger compartment, and FIG. 4 shows a front view of the operation panel of the device of the present invention attached to the instrument panel.

FIG. 5 is an electrical circuit diagram for operating the device. In the figure, 9 is a battery power source, 10 is a power switch for operating the device, and an auxiliary fan 7 for circulating warm air along the floor is connected in parallel with the blower 3. 11 is a switch for operating fan 1;
Reference numeral 2 denotes a group of resistances for switching the rotation speed of the blower, which is incorporated in the grounding circuit of the blower 3, and the resistance value is selected by a slide type rotary set switch 13 for adjusting the air blower (6). 14 is an operation panel of the device.

Next, the operation of the embodiment device having the above configuration will be explained. After the power switch 10 is turned on, the blower operation switch 13 on the operation panel 14 is switched from the OFF position to the contact point of the desired blowing strength, and the front seat is The supply of warm air is started from the hot air outlet a which opens near the floor surface of the room. The warm air that collides with the lower part of the front seat begins to rise, but is sucked into the nearby circulating air intake, causing the warm air circulating flow around the feet of the front seat passenger, as shown by the arrow (a) in the diagram. It is formed. If you want to apply the same warm airflow around the feet of the front seats to the rear seat passenger type, by turning on the activation switch 11 of the auxiliary fan 7, the warm air near the floor of the front seats will be
The air is sucked into the air, passed through the suction port d, and is blown out from the suction port e toward the feet of the rear seat passengers.As shown in FIG. 2, which is a top view of FIG. The air flows into the left and right sides (b) and washes around the feet of the rear seat occupants, then returns to the floor of the front seat along the walls on both sides of the passenger compartment and is sucked into the circulating air intake of the device. However, a part of the warm air blown to the rear seats by the auxiliary fan 1 turns upward and follows the flow path (E) where it is sucked toward the exhaust port F at the rear of the vehicle, so it also has the effect of warming the entire rear seat space. This improves one of the drawbacks of conventional air conditioning systems, which is that the rear seats tend to lack a relatively warm feeling compared to the front seats. The warm air that circulates along the floor of the single room in this way is blown out horizontally or upward from the hot air outlet provided on the conventional instrument panel, as shown by arrows (C) and (D) in the figure. Unlike the case where warm air flows into the vehicle and touches the window glass or ceiling, which have poor insulation properties, the retained heat is rapidly carried out of the vehicle.
Because it has a double wall structure or is surrounded by a highly insulated peripheral wall covered with floor mats, the degree of retained heat being dissipated to the outside of the vehicle through the vehicle body is sufficiently low, and it is also possible to introduce outside air for ventilation. Since heating is not accompanied by any heat loss, heating is performed with extremely low heat loss. ' Since the device of the present invention described above was developed as an auxiliary device for an existing normal heating and cooling unit, it can of course be used in conjunction with this heating and cooling unit.

At that time, if the existing heating unit is operated weakly and the auxiliary heating unit according to the present invention is operated strongly, it is possible to perform ideal heating for so-called cold head and foot heat due to the positional relationship of the air outlets. The air flow (c) from the ventilation outlet of the existing air-conditioning unit has the behavior of lifting warm air from the lower part of the vehicle interior into the upper space of the vehicle interior, but the circulating air intake of this auxiliary heating unit As shown by the arrow, the air tends to simultaneously draw in some of the warm air that exists in the upper space of the vehicle interior and blow it out in contact with the floor surface, making it easier for this phenomenon to occur. So it contributes to creating a cold head and foot fever situation.

Next, in FIG. 6, which is a side sectional view of an automobile showing the second embodiment of the present invention, a branch duct 16 for extending the air outlet is attached to the hot air outlet a of the device, and the above-mentioned h, which plays a role in place of the auxiliary fan 7 in the first embodiment, is an outlet of the branch duct 16, which opens near the floor surface of the rear seat. The warm air blown into the rear seats passes through the gap at the bottom of the rear seats and returns near the floor of the front seats. In this diagram, branch duct 1
6 extends to the front end of the rear seat, but it is also possible to limit it to the vicinity of the rear end of the front seat.

Furthermore, in the case shown in FIG. 7, which depicts the third embodiment of the present invention as a side sectional view of an automobile, the device A of the present invention is located not in the lower part of the instrument panel, but in the two seats of the front seat G. attached between. One set of warm air outlet a and a circulating air intake port are provided in the casing 1 of the device so as to open toward the front seat floor surface and the rear seat floor surface. 17 is a duct for extending the air intake port.

In addition, in this example, the hot water circulation piping 18 to the heater core 2
and 19 are heater cores M built in the air conditioning unit B.
The heater cores 2 and M are provided not in series but in parallel with the pipes 4 and 5, and the heating capacity of each heater core 2 and M can be adjusted independently by valves 6 and 20 interposed in the respective pipes. The device of this embodiment is characterized in that it can sufficiently heat the feet of rear seat occupants, and can effectively utilize the space under the seat. If necessary, the casing 1 may be connected to a refrigerant pipe supplied from an on-vehicle refrigerator or a duct of cold air supplied from an air-conditioning unit to serve as an auxiliary air conditioner.

As described above, by using the auxiliary heating device according to the present invention in combination with the existing air conditioning/heating unit, it is desirable to sufficiently warm the interior of the vehicle, which is advantageous in that there is less heat transfer loss through the vehicle body wall to the outside of the vehicle. The lower half of the vehicle, especially the area around the feet, should be covered by an auxiliary heating system, and it is physiologically undesirable to heat it too strongly, and the upper part of the vehicle interior where heat is easily lost through the window glass and ceiling surface. The anti-fog function of the window glass can now be assigned to a heating unit that works lightly, making it possible to achieve more comfortable air conditioning and heating, and the thermal energy required for heating is almost half that of conventional heating methods. It was confirmed that this was sufficient. That is,
The amount of heat generated by the existing heating unit is sufficient to be around 40% of the current amount, and the auxiliary heating device only needs to generate about 10% of the total heat energy required for conventional heating from a place with high thermal efficiency. By combining these two types of energy, satisfactory air conditioning in the vehicle interior can be achieved with 50% of the heating energy consumption of conventional heating energy. Therefore, the device of the present invention can be used as a conventional heating device.
By using it in conjunction with the Ii installation, the problem of insufficient heating capacity, which often occurs in cars equipped with diesel engines or high-speed gasoline engines with high fuel combustion efficiency, will be solved at once, at least for small vehicles. Become.

[Brief explanation of drawings]

Figure 1 is a side sectional view of an automobile equipped with the device of the present invention;
The figure is a top view of Figure 1, Figure 3 is a front view of the instrument panel showing the position of the device, Figure M4 is a front view of the operation panel of the device, Figure 5 is an electrical circuit diagram for controlling the device, and Figure 6 and FIG. 7 are side sectional views of an automobile depicting two other embodiments of the device of the present invention.

Claims (1)

[Claims] 1) A heating/cooling heat exchanger and a blower are installed in a ventilation passage in which an inside/outside air switching box is provided at the inlet end and a ventilation outlet, a defrost outlet, and a heat outlet are provided at the outlet end. This is an auxiliary device for the main heating system, which is housed in a casing that is equipped with a warm air outlet that can generate a heating airflow that circulates around the passenger's feet, and an inlet for the circulating air. A heating system for a vehicle that includes a heater core that uses a heat source as a heat source, and a blower. 2) The heating device for a vehicle according to claim 1, characterized in that an auxiliary fan for forcibly generating the circulating heating airflow, which is placed separately in the vehicle interior, is also used. 3) The heating device for a vehicle according to claim 1, wherein the hot air outlet is provided with a duct for extending the outlet. 4) The heating device for a vehicle according to any one of claims 1 to 3, further comprising an outlet for blowing cold heat supplied from a separately installed cooling device. 5) The vehicle heating device according to any one of claims 1 to 4, further comprising means for adjusting the amount of hot water flowing into the heater core. 6) The casing is installed at the lower center of an instrument panel of a passenger car, and the fan for forced circulation airflow is installed at the lower part of the front seat. The vehicle heating device according to any one of items 3 to 5. 7) The heating device for a vehicle according to any one of claims 1 and 3 to 5, wherein the casing is installed under a seat of a vehicle.